Drill chuck



June 12, 1951 l A. MORIN; 2,556263 DRILL CHUCK .Fi1ed mayv 21, 1949 AUGUSTO FIQRIN F| G. 4 xNvENToR 4J ATTORNEYS;

Patented June 12, 1951 STATES ATENT OFFICE Application May 21, 1949, Serial No. 94,662 In Italy February 10, 1949 1 Claim. 1

This invention relates to drill-chucks for the drilling machines with conical-shaped end spindle.

This device is constituted by a tubular sleeve, bored so as to provide two female tapers therein, viz.: one at one end corresponding to the coupling male cone and the other (Morse or the like) at the opposite end; at the meeting point of the two tapers there is provided a slot adapted to receive a disconnecting implement which is necessary in machines lacking an extracting nut, in which the uncoupling would prove toilsome and require the use of emergency means that might prove injurious to the machine.

The coupling sleeve according to the invention is illustrated by way of example inthe annexed drawings showing one practical but in no way limiting embodiment thereof, Fig. 1 being an external View; Fig, 2 a vertical axial section; Fig. 3 a plan view; Fig. 4 shows the uncoupling method.

As is seen in the drawings, the coupling sleeve according to the invention is substantially of a cylindrical form, having two parts I, 2 knurled or roughed or otherwise formed so as to facilitate their grasping by the hand.

In the upper part there is formed a slightly tapered seat 3 corresponding to the coupling male spindle cone, whereas the bore of the lower part has a steeper taper (Morse or like tapers) corresponding to the taper shank of the tool to be mounted on the machine.

Said two conical seats are in communication with one another by means of a slot 5 which transxes the coupling sleeve.

Into the slot projects the too1 tail which, as it 2 extends also into a small portion cf the seat 3, abuts therein, when in operation, against the lower end of the cone inserted into the seat.

The mounting of the coupling sleeve on the cone of the machine and the insertion of the tool into the coupling sleeve are carried out by simple introduction and then forcing upwards.

The uncoupling is performed by introducing a trapezoidal wedge into the slot 5 and forcing it between the end of the spindle cone and the end of the tool thereby causing them to separate from one another and thus disconnect the coupling.

What I claim is:

A drill-chuck comprising a holder having coaxial tapered sockets opening out of opposite ends to receive the machine spindle and tool shank, and a diametrical slot intermediate the adjacent ends of the sockets and projecting substantially transversely of and into the said adjacent ends of the sockets, and a single tapered wedge in said slot adapted to contact the ends of the spindle and too1 shank to govern the spacing therebetween. Y n

AUGUSTO FIORINI.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 410,601 Moyle Sept. 10, 1889 647,020 Muller Apr. 10, 1900 792,433 Manchester June 13, 1905 1,041,792 Hill Oct. 22, 1912 

